An under-trial prisoner (UTP) died in the Jharpada jail here. The prisoner, Bihari Jena, had been arrested six months back on the charge of killing a youth in the Bomikhal area of the city.Jena’s body was taken to the Capital Hospital for postmortem. Jail sources said Jena was sick and felt uncomfortable on Sunday night and died on the way to the hospital.His death could have occurred due to a heart attack. The exact reason of his death would be established after the post-mortem, the sources added.